Genetic Variability and Genotypic, Phenotypic Correlation Studies for Yield and Related Traits In Single Cross Hybrids of Maize (Zea Mays L.)

2014 ◽  
Vol 2 (1) ◽  
pp. 138-145
Author(s):  
Mohammed Mohammed
Keyword(s):  
Zea Mays ◽  
Genetic Variability ◽  
Zea Mays L ◽  
Phenotypic Correlation ◽  
Correlation Studies ◽  
Single Cross ◽  
Single Cross Hybrids

scholarly journals Heterotic expression in inbreds derived from four different base populations in maize (Zea mays L.).

1970 ◽  
pp. 10-15
Author(s):  
B. Bharathiveeramani ◽  
M. Prakash ◽  
A. Seetharam
Keyword(s):  
Zea Mays ◽  
Combining Ability ◽  
Zea Mays L ◽  
Commercial Exploitation ◽  
Single Cross ◽  
Standard Heterosis ◽  
Maize Inbreds ◽  
Hybrid Mixtures ◽  
Single Cross Hybrids

The concepts of combining ability and heterosis are the fundamental tools for enhancing productivity of different crops. The main objective is to study the usefulness of inbreds derived from four different base populations namely advanced generations of single cross hybrids, three way cross hybrids, hybrid mixtures and composites by analyzing the combining ability of inbreds and crosses derived and the heterosis obtained for important characters. One hundred and forty four maize inbreds derived from four different base populations namely advanced generations of single cross hybrids, three way cross hybrids, hybrid mixtures and composites were studied for their heterotic expression. The results indicated that composite and hybrid mixture base populations shall be of great use in deriving genetically divergent inbreds and single cross hybrids with significant standard heterosis suitable for commercial exploitation.

scholarly journals Genetic Testing of Inbred Lines and Single Cross Hybrids against Fusarium Stalk Rot Caused by Fusarium moniliforme in Maize (Zea mays L.)

2021 ◽  
Vol 10 (11) ◽  
pp. 352-361
Author(s):  
R. Archana H. C. Lohithaswa ◽  
R. Pavan B. N. Swathi ◽  
N. Mallikarjuna
Keyword(s):  
Zea Mays ◽  
Genetic Testing ◽  
Fusarium Moniliforme ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Yield Potential ◽  
Disease Score ◽  
Stalk Rot ◽  
Single Cross ◽  
Single Cross Hybrids

Globally, Maize (Zea mays L.) is a third major cereal food crop. It is a multipurpose crop with 26% of its production is used as food by human beings. Maize is known as “queen of cereals”, because of its high genetic yield potential, efficient utilization of radiant energy and wider adaptability. About 65 different phytopathogens affect the maize production in different stages of life cycle. Among which Fusarium moniliforme is one such soil borne pathogen causes Fusarium stalk rot (FSR) disease that ultimately reduces maize yield potential over the world. In any breeding program, screening and genetic testing of available germplasm resources against pathogens is necessary to prevent yield losses. Hence, the present research screened around 114 maize inbred lines and 45 single cross hybrids (SCHs) against FSR under artificial epiphytotic conditions. Among 114 inbreds, only four inbreds viz., CM 202, 10878, MAI-759 and MAI-766 (mean disease score of 3-4) showed moderately resistant reaction and out of 45 SCHs, only one hybrid combination i.e., MAI329 × CM202 (mean disease score was 2.60) exhibited resistance reaction against Fusarium stalk rot. Nevertheless, these resistance sources could be utilized in maize breeding programs for obtaining high yielding cultivars with resistance towards FSR disease.

scholarly journals Efectos genéticos en híbridos de maíz tropical (Zea mays L.) III. Acame, mala cobertura y pudrición de mazorca.

2016 ◽  
Vol 7 (1) ◽  
pp. 47
Author(s):  
Gaspar Martínez ◽  
Humberto De León-Castillo
Keyword(s):  
Zea Mays ◽  
Genetic Variance ◽  
Zea Mays L ◽  
Additive Genetic Variance ◽  
Ear Rot ◽  
Humid Tropic ◽  
Single Cross ◽  
Main Effects ◽  
Single Cross Hybrids ◽  
Interaction Variance

This study report genetic effects for lodging, uncovered ears and ear rot, of 42 single cross hybrids made with seven lines developed in the humid tropic of México, and six lines developed in the dry tropic, using a North Caroline II mating design. Hybrid variation was mainly due to GCA variance, and scanty to SCA variance for all the three attributes, although for ear rot, SCA variance had a considerable role, too. Partitioning GCA variance, revealed humid tropic lines had highest contribution to lodging and ear covering variance, and dry tropic lines the highest contribution to ear rot variance. In addition, humid tropic lines had higher GCAxEnvironment interaction variance than dry tropic lines. In conclusion, GCA effects, which reveal additive genetic variance, were the main effects for all the three attributes, and that GCA effects were higher in humid tropic lines than those of the dry tropic, maybe due to their mobilization in a more ample and diverse region.

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